15a-6a=90

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Solution for 15a-6a=90 equation: 


Simplifying
15a + -6a = 90

Combine like terms: 15a + -6a = 9a
9a = 90

Solving
9a = 90

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Divide each side by '9'.
a = 10

Simplifying
a = 10

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